Fragment.java revision 16f6e89c2a4bbf73fe15cb2e81c8fec98c7ac831
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.app; 18 19import android.animation.Animator; 20import android.content.ComponentCallbacks; 21import android.content.Context; 22import android.content.Intent; 23import android.content.res.Configuration; 24import android.content.res.Resources; 25import android.os.Bundle; 26import android.os.Parcel; 27import android.os.Parcelable; 28import android.util.AndroidRuntimeException; 29import android.util.AttributeSet; 30import android.util.DebugUtils; 31import android.util.SparseArray; 32import android.view.ContextMenu; 33import android.view.LayoutInflater; 34import android.view.Menu; 35import android.view.MenuInflater; 36import android.view.MenuItem; 37import android.view.View; 38import android.view.ViewGroup; 39import android.view.ContextMenu.ContextMenuInfo; 40import android.view.View.OnCreateContextMenuListener; 41import android.widget.AdapterView; 42 43import java.io.FileDescriptor; 44import java.io.PrintWriter; 45import java.util.HashMap; 46 47final class FragmentState implements Parcelable { 48 final String mClassName; 49 final int mIndex; 50 final boolean mFromLayout; 51 final int mFragmentId; 52 final int mContainerId; 53 final String mTag; 54 final boolean mRetainInstance; 55 final boolean mDetached; 56 final Bundle mArguments; 57 58 Bundle mSavedFragmentState; 59 60 Fragment mInstance; 61 62 public FragmentState(Fragment frag) { 63 mClassName = frag.getClass().getName(); 64 mIndex = frag.mIndex; 65 mFromLayout = frag.mFromLayout; 66 mFragmentId = frag.mFragmentId; 67 mContainerId = frag.mContainerId; 68 mTag = frag.mTag; 69 mRetainInstance = frag.mRetainInstance; 70 mDetached = frag.mDetached; 71 mArguments = frag.mArguments; 72 } 73 74 public FragmentState(Parcel in) { 75 mClassName = in.readString(); 76 mIndex = in.readInt(); 77 mFromLayout = in.readInt() != 0; 78 mFragmentId = in.readInt(); 79 mContainerId = in.readInt(); 80 mTag = in.readString(); 81 mRetainInstance = in.readInt() != 0; 82 mDetached = in.readInt() != 0; 83 mArguments = in.readBundle(); 84 mSavedFragmentState = in.readBundle(); 85 } 86 87 public Fragment instantiate(Activity activity) { 88 if (mInstance != null) { 89 return mInstance; 90 } 91 92 if (mArguments != null) { 93 mArguments.setClassLoader(activity.getClassLoader()); 94 } 95 96 mInstance = Fragment.instantiate(activity, mClassName, mArguments); 97 98 if (mSavedFragmentState != null) { 99 mSavedFragmentState.setClassLoader(activity.getClassLoader()); 100 mInstance.mSavedFragmentState = mSavedFragmentState; 101 } 102 mInstance.setIndex(mIndex); 103 mInstance.mFromLayout = mFromLayout; 104 mInstance.mRestored = true; 105 mInstance.mFragmentId = mFragmentId; 106 mInstance.mContainerId = mContainerId; 107 mInstance.mTag = mTag; 108 mInstance.mRetainInstance = mRetainInstance; 109 mInstance.mDetached = mDetached; 110 mInstance.mFragmentManager = activity.mFragments; 111 112 return mInstance; 113 } 114 115 public int describeContents() { 116 return 0; 117 } 118 119 public void writeToParcel(Parcel dest, int flags) { 120 dest.writeString(mClassName); 121 dest.writeInt(mIndex); 122 dest.writeInt(mFromLayout ? 1 : 0); 123 dest.writeInt(mFragmentId); 124 dest.writeInt(mContainerId); 125 dest.writeString(mTag); 126 dest.writeInt(mRetainInstance ? 1 : 0); 127 dest.writeInt(mDetached ? 1 : 0); 128 dest.writeBundle(mArguments); 129 dest.writeBundle(mSavedFragmentState); 130 } 131 132 public static final Parcelable.Creator<FragmentState> CREATOR 133 = new Parcelable.Creator<FragmentState>() { 134 public FragmentState createFromParcel(Parcel in) { 135 return new FragmentState(in); 136 } 137 138 public FragmentState[] newArray(int size) { 139 return new FragmentState[size]; 140 } 141 }; 142} 143 144/** 145 * A Fragment is a piece of an application's user interface or behavior 146 * that can be placed in an {@link Activity}. Interaction with fragments 147 * is done through {@link FragmentManager}, which can be obtained via 148 * {@link Activity#getFragmentManager() Activity.getFragmentManager()} and 149 * {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}. 150 * 151 * <p>The Fragment class can be used many ways to achieve a wide variety of 152 * results. It is core, it represents a particular operation or interface 153 * that is running within a larger {@link Activity}. A Fragment is closely 154 * tied to the Activity it is in, and can not be used apart from one. Though 155 * Fragment defines its own lifecycle, that lifecycle is dependent on its 156 * activity: if the activity is stopped, no fragments inside of it can be 157 * started; when the activity is destroyed, all fragments will be destroyed. 158 * 159 * <p>All subclasses of Fragment must include a public empty constructor. 160 * The framework will often re-instantiate a fragment class when needed, 161 * in particular during state restore, and needs to be able to find this 162 * constructor to instantiate it. If the empty constructor is not available, 163 * a runtime exception will occur in some cases during state restore. 164 * 165 * <p>Topics covered here: 166 * <ol> 167 * <li><a href="#Lifecycle">Lifecycle</a> 168 * <li><a href="#Layout">Layout</a> 169 * <li><a href="#BackStack">Back Stack</a> 170 * </ol> 171 * 172 * <a name="Lifecycle"></a> 173 * <h3>Lifecycle</h3> 174 * 175 * <p>Though a Fragment's lifecycle is tied to its owning activity, it has 176 * its own wrinkle on the standard activity lifecycle. It includes basic 177 * activity lifecycle methods such as {@link #onResume}, but also important 178 * are methods related to interactions with the activity and UI generation. 179 * 180 * <p>The core series of lifecycle methods that are called to bring a fragment 181 * up to resumed state (interacting with the user) are: 182 * 183 * <ol> 184 * <li> {@link #onAttach} called once the fragment is associated with its activity. 185 * <li> {@link #onCreate} called to do initial creation of the fragment. 186 * <li> {@link #onCreateView} creates and returns the view hierarchy associated 187 * with the fragment. 188 * <li> {@link #onActivityCreated} tells the fragment that its activity has 189 * completed its own {@link Activity#onCreate Activity.onCreaate}. 190 * <li> {@link #onStart} makes the fragment visible to the user (based on its 191 * containing activity being started). 192 * <li> {@link #onResume} makes the fragment interacting with the user (based on its 193 * containing activity being resumed). 194 * </ol> 195 * 196 * <p>As a fragment is no longer being used, it goes through a reverse 197 * series of callbacks: 198 * 199 * <ol> 200 * <li> {@link #onPause} fragment is no longer interacting with the user either 201 * because its activity is being paused or a fragment operation is modifying it 202 * in the activity. 203 * <li> {@link #onStop} fragment is no longer visible to the user either 204 * because its activity is being stopped or a fragment operation is modifying it 205 * in the activity. 206 * <li> {@link #onDestroyView} allows the fragment to clean up resources 207 * associated with its View. 208 * <li> {@link #onDestroy} called to do final cleanup of the fragment's state. 209 * <li> {@link #onDetach} called immediately prior to the fragment no longer 210 * being associated with its activity. 211 * </ol> 212 * 213 * <a name="Layout"></a> 214 * <h3>Layout</h3> 215 * 216 * <p>Fragments can be used as part of your application's layout, allowing 217 * you to better modularize your code and more easily adjust your user 218 * interface to the screen it is running on. As an example, we can look 219 * at a simple program consisting of a list of items, and display of the 220 * details of each item.</p> 221 * 222 * <p>An activity's layout XML can include <code><fragment></code> tags 223 * to embed fragment instances inside of the layout. For example, here is 224 * a simple layout that embeds one fragment:</p> 225 * 226 * {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout} 227 * 228 * <p>The layout is installed in the activity in the normal way:</p> 229 * 230 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 231 * main} 232 * 233 * <p>The titles fragment, showing a list of titles, is fairly simple, relying 234 * on {@link ListFragment} for most of its work. Note the implementation of 235 * clicking an item: depending on the current activity's layout, it can either 236 * create and display a new fragment to show the details in-place (more about 237 * this later), or start a new activity show the details.</p> 238 * 239 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 240 * titles} 241 * 242 * <p>The details fragment showing the contents of selected item here just 243 * displays a string of text based on an index of a string array built in to 244 * the app:</p> 245 * 246 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 247 * details} 248 * 249 * <p>In this case when the user clicks on a title, there is no details 250 * container in the current activity, so the title title fragment's click code will 251 * launch a new activity to display the details fragment:</p> 252 * 253 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java 254 * details_activity} 255 * 256 * <p>However the screen may be large enough to show both the list of titles 257 * and details about the currently selected title. To use such a layout on 258 * a landscape screen, this alternative layout can be placed under layout-land:</p> 259 * 260 * {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout} 261 * 262 * <p>Note how the prior code will adjust to this alternative UI flow: the titles 263 * fragment will now embed the details fragment inside of this activity, and the 264 * details activity will finish itself if it is running in a configuration 265 * where the details can be shown in-place. 266 * 267 * <p>When a configuration change causes the activity hosting these fragments 268 * to restart, its new instance may use a different layout that doesn't 269 * include the same fragments as the previous layout. In this case all of 270 * the previous fragments will still be instantiated and running in the new 271 * instance. However, any that are no longer associated with a <fragment> 272 * tag in the view hierarchy will not have their content view created 273 * and will return false from {@link #isInLayout}. (The code here also shows 274 * how you can determine if a fragment placed in a container is no longer 275 * running in a layout with that container and avoid creating its view hierarchy 276 * in that case.) 277 * 278 * <p>The attributes of the <fragment> tag are used to control the 279 * LayoutParams provided when attaching the fragment's view to the parent 280 * container. They can also be parsed by the fragment in {@link #onInflate} 281 * as parameters. 282 * 283 * <p>The fragment being instantiated must have some kind of unique identifier 284 * so that it can be re-associated with a previous instance if the parent 285 * activity needs to be destroyed and recreated. This can be provided these 286 * ways: 287 * 288 * <ul> 289 * <li>If nothing is explicitly supplied, the view ID of the container will 290 * be used. 291 * <li><code>android:tag</code> can be used in <fragment> to provide 292 * a specific tag name for the fragment. 293 * <li><code>android:id</code> can be used in <fragment> to provide 294 * a specific identifier for the fragment. 295 * </ul> 296 * 297 * <a name="BackStack"></a> 298 * <h3>Back Stack</h3> 299 * 300 * <p>The transaction in which fragments are modified can be placed on an 301 * internal back-stack of the owning activity. When the user presses back 302 * in the activity, any transactions on the back stack are popped off before 303 * the activity itself is finished. 304 * 305 * <p>For example, consider this simple fragment that is instantiated with 306 * an integer argument and displays that in a TextView in its UI:</p> 307 * 308 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 309 * fragment} 310 * 311 * <p>A function that creates a new instance of the fragment, replacing 312 * whatever current fragment instance is being shown and pushing that change 313 * on to the back stack could be written as: 314 * 315 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java 316 * add_stack} 317 * 318 * <p>After each call to this function, a new entry is on the stack, and 319 * pressing back will pop it to return the user to whatever previous state 320 * the activity UI was in. 321 */ 322public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener { 323 private static final HashMap<String, Class<?>> sClassMap = 324 new HashMap<String, Class<?>>(); 325 326 static final int INITIALIZING = 0; // Not yet created. 327 static final int CREATED = 1; // Created. 328 static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. 329 static final int STOPPED = 3; // Fully created, not started. 330 static final int STARTED = 4; // Created and started, not resumed. 331 static final int RESUMED = 5; // Created started and resumed. 332 333 int mState = INITIALIZING; 334 335 // Non-null if the fragment's view hierarchy is currently animating away, 336 // meaning we need to wait a bit on completely destroying it. This is the 337 // animation that is running. 338 Animator mAnimatingAway; 339 340 // If mAnimatingAway != null, this is the state we should move to once the 341 // animation is done. 342 int mStateAfterAnimating; 343 344 // When instantiated from saved state, this is the saved state. 345 Bundle mSavedFragmentState; 346 SparseArray<Parcelable> mSavedViewState; 347 348 // Index into active fragment array. 349 int mIndex = -1; 350 351 // Internal unique name for this fragment; 352 String mWho; 353 354 // Construction arguments; 355 Bundle mArguments; 356 357 // Target fragment. 358 Fragment mTarget; 359 360 // Target request code. 361 int mTargetRequestCode; 362 363 // True if the fragment is in the list of added fragments. 364 boolean mAdded; 365 366 // If set this fragment is being removed from its activity. 367 boolean mRemoving; 368 369 // True if the fragment is in the resumed state. 370 boolean mResumed; 371 372 // Set to true if this fragment was instantiated from a layout file. 373 boolean mFromLayout; 374 375 // Set to true when the view has actually been inflated in its layout. 376 boolean mInLayout; 377 378 // True if this fragment has been restored from previously saved state. 379 boolean mRestored; 380 381 // Number of active back stack entries this fragment is in. 382 int mBackStackNesting; 383 384 // The fragment manager we are associated with. Set as soon as the 385 // fragment is used in a transaction; cleared after it has been removed 386 // from all transactions. 387 FragmentManager mFragmentManager; 388 389 // Set as soon as a fragment is added to a transaction (or removed), 390 // to be able to do validation. 391 Activity mImmediateActivity; 392 393 // Activity this fragment is attached to. 394 Activity mActivity; 395 396 // The optional identifier for this fragment -- either the container ID if it 397 // was dynamically added to the view hierarchy, or the ID supplied in 398 // layout. 399 int mFragmentId; 400 401 // When a fragment is being dynamically added to the view hierarchy, this 402 // is the identifier of the parent container it is being added to. 403 int mContainerId; 404 405 // The optional named tag for this fragment -- usually used to find 406 // fragments that are not part of the layout. 407 String mTag; 408 409 // Set to true when the app has requested that this fragment be hidden 410 // from the user. 411 boolean mHidden; 412 413 // Set to true when the app has requested that this fragment be detached. 414 boolean mDetached; 415 416 // If set this fragment would like its instance retained across 417 // configuration changes. 418 boolean mRetainInstance; 419 420 // If set this fragment is being retained across the current config change. 421 boolean mRetaining; 422 423 // If set this fragment has menu items to contribute. 424 boolean mHasMenu; 425 426 // Used to verify that subclasses call through to super class. 427 boolean mCalled; 428 429 // If app has requested a specific animation, this is the one to use. 430 int mNextAnim; 431 432 // The parent container of the fragment after dynamically added to UI. 433 ViewGroup mContainer; 434 435 // The View generated for this fragment. 436 View mView; 437 438 LoaderManagerImpl mLoaderManager; 439 boolean mLoadersStarted; 440 boolean mCheckedForLoaderManager; 441 442 /** 443 * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when 444 * there is an instantiation failure. 445 */ 446 static public class InstantiationException extends AndroidRuntimeException { 447 public InstantiationException(String msg, Exception cause) { 448 super(msg, cause); 449 } 450 } 451 452 /** 453 * Default constructor. <strong>Every</strong> fragment must have an 454 * empty constructor, so it can be instantiated when restoring its 455 * activity's state. It is strongly recommended that subclasses do not 456 * have other constructors with parameters, since these constructors 457 * will not be called when the fragment is re-instantiated; instead, 458 * arguments can be supplied by the caller with {@link #setArguments} 459 * and later retrieved by the Fragment with {@link #getArguments}. 460 * 461 * <p>Applications should generally not implement a constructor. The 462 * first place application code an run where the fragment is ready to 463 * be used is in {@link #onAttach(Activity)}, the point where the fragment 464 * is actually associated with its activity. Some applications may also 465 * want to implement {@link #onInflate} to retrieve attributes from a 466 * layout resource, though should take care here because this happens for 467 * the fragment is attached to its activity. 468 */ 469 public Fragment() { 470 } 471 472 /** 473 * Like {@link #instantiate(Context, String, Bundle)} but with a null 474 * argument Bundle. 475 */ 476 public static Fragment instantiate(Context context, String fname) { 477 return instantiate(context, fname, null); 478 } 479 480 /** 481 * Create a new instance of a Fragment with the given class name. This is 482 * the same as calling its empty constructor. 483 * 484 * @param context The calling context being used to instantiate the fragment. 485 * This is currently just used to get its ClassLoader. 486 * @param fname The class name of the fragment to instantiate. 487 * @param args Bundle of arguments to supply to the fragment, which it 488 * can retrieve with {@link #getArguments()}. May be null. 489 * @return Returns a new fragment instance. 490 * @throws InstantiationException If there is a failure in instantiating 491 * the given fragment class. This is a runtime exception; it is not 492 * normally expected to happen. 493 */ 494 public static Fragment instantiate(Context context, String fname, Bundle args) { 495 try { 496 Class<?> clazz = sClassMap.get(fname); 497 if (clazz == null) { 498 // Class not found in the cache, see if it's real, and try to add it 499 clazz = context.getClassLoader().loadClass(fname); 500 sClassMap.put(fname, clazz); 501 } 502 Fragment f = (Fragment)clazz.newInstance(); 503 if (args != null) { 504 args.setClassLoader(f.getClass().getClassLoader()); 505 f.mArguments = args; 506 } 507 return f; 508 } catch (ClassNotFoundException e) { 509 throw new InstantiationException("Unable to instantiate fragment " + fname 510 + ": make sure class name exists, is public, and has an" 511 + " empty constructor that is public", e); 512 } catch (java.lang.InstantiationException e) { 513 throw new InstantiationException("Unable to instantiate fragment " + fname 514 + ": make sure class name exists, is public, and has an" 515 + " empty constructor that is public", e); 516 } catch (IllegalAccessException e) { 517 throw new InstantiationException("Unable to instantiate fragment " + fname 518 + ": make sure class name exists, is public, and has an" 519 + " empty constructor that is public", e); 520 } 521 } 522 523 final void restoreViewState() { 524 if (mSavedViewState != null) { 525 mView.restoreHierarchyState(mSavedViewState); 526 mSavedViewState = null; 527 } 528 } 529 530 final void setIndex(int index) { 531 mIndex = index; 532 mWho = "android:fragment:" + mIndex; 533 } 534 535 final void clearIndex() { 536 mIndex = -1; 537 mWho = null; 538 } 539 540 final boolean isInBackStack() { 541 return mBackStackNesting > 0; 542 } 543 544 /** 545 * Subclasses can not override equals(). 546 */ 547 @Override final public boolean equals(Object o) { 548 return super.equals(o); 549 } 550 551 /** 552 * Subclasses can not override hashCode(). 553 */ 554 @Override final public int hashCode() { 555 return super.hashCode(); 556 } 557 558 @Override 559 public String toString() { 560 StringBuilder sb = new StringBuilder(128); 561 DebugUtils.buildShortClassTag(this, sb); 562 if (mIndex >= 0) { 563 sb.append(" #"); 564 sb.append(mIndex); 565 } 566 if (mFragmentId != 0) { 567 sb.append(" id=0x"); 568 sb.append(Integer.toHexString(mFragmentId)); 569 } 570 if (mTag != null) { 571 sb.append(" "); 572 sb.append(mTag); 573 } 574 sb.append('}'); 575 return sb.toString(); 576 } 577 578 /** 579 * Return the identifier this fragment is known by. This is either 580 * the android:id value supplied in a layout or the container view ID 581 * supplied when adding the fragment. 582 */ 583 final public int getId() { 584 return mFragmentId; 585 } 586 587 /** 588 * Get the tag name of the fragment, if specified. 589 */ 590 final public String getTag() { 591 return mTag; 592 } 593 594 /** 595 * Supply the construction arguments for this fragment. This can only 596 * be called before the fragment has been attached to its activity; that 597 * is, you should call it immediately after constructing the fragment. The 598 * arguments supplied here will be retained across fragment destroy and 599 * creation. 600 */ 601 public void setArguments(Bundle args) { 602 if (mIndex >= 0) { 603 throw new IllegalStateException("Fragment already active"); 604 } 605 mArguments = args; 606 } 607 608 /** 609 * Return the arguments supplied when the fragment was instantiated, 610 * if any. 611 */ 612 final public Bundle getArguments() { 613 return mArguments; 614 } 615 616 /** 617 * Optional target for this fragment. This may be used, for example, 618 * if this fragment is being started by another, and when done wants to 619 * give a result back to the first. The target set here is retained 620 * across instances via {@link FragmentManager#putFragment 621 * FragmentManager.putFragment()}. 622 * 623 * @param fragment The fragment that is the target of this one. 624 * @param requestCode Optional request code, for convenience if you 625 * are going to call back with {@link #onActivityResult(int, int, Intent)}. 626 */ 627 public void setTargetFragment(Fragment fragment, int requestCode) { 628 mTarget = fragment; 629 mTargetRequestCode = requestCode; 630 } 631 632 /** 633 * Return the target fragment set by {@link #setTargetFragment}. 634 */ 635 final public Fragment getTargetFragment() { 636 return mTarget; 637 } 638 639 /** 640 * Return the target request code set by {@link #setTargetFragment}. 641 */ 642 final public int getTargetRequestCode() { 643 return mTargetRequestCode; 644 } 645 646 /** 647 * Return the Activity this fragment is currently associated with. 648 */ 649 final public Activity getActivity() { 650 return mActivity; 651 } 652 653 /** 654 * Return <code>getActivity().getResources()</code>. 655 */ 656 final public Resources getResources() { 657 if (mActivity == null) { 658 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 659 } 660 return mActivity.getResources(); 661 } 662 663 /** 664 * Return a localized, styled CharSequence from the application's package's 665 * default string table. 666 * 667 * @param resId Resource id for the CharSequence text 668 */ 669 public final CharSequence getText(int resId) { 670 return getResources().getText(resId); 671 } 672 673 /** 674 * Return a localized string from the application's package's 675 * default string table. 676 * 677 * @param resId Resource id for the string 678 */ 679 public final String getString(int resId) { 680 return getResources().getString(resId); 681 } 682 683 /** 684 * Return a localized formatted string from the application's package's 685 * default string table, substituting the format arguments as defined in 686 * {@link java.util.Formatter} and {@link java.lang.String#format}. 687 * 688 * @param resId Resource id for the format string 689 * @param formatArgs The format arguments that will be used for substitution. 690 */ 691 692 public final String getString(int resId, Object... formatArgs) { 693 return getResources().getString(resId, formatArgs); 694 } 695 696 /** 697 * Return the FragmentManager for interacting with fragments associated 698 * with this fragment's activity. Note that this will be non-null slightly 699 * before {@link #getActivity()}, during the time from when the fragment is 700 * placed in a {@link FragmentTransaction} until it is committed and 701 * attached to its activity. 702 */ 703 final public FragmentManager getFragmentManager() { 704 return mFragmentManager; 705 } 706 707 /** 708 * Return true if the fragment is currently added to its activity. 709 */ 710 final public boolean isAdded() { 711 return mActivity != null && mAdded; 712 } 713 714 /** 715 * Return true if this fragment is currently being removed from its 716 * activity. This is <em>not</em> whether its activity is finishing, but 717 * rather whether it is in the process of being removed from its activity. 718 */ 719 final public boolean isRemoving() { 720 return mRemoving; 721 } 722 723 /** 724 * Return true if the layout is included as part of an activity view 725 * hierarchy via the <fragment> tag. This will always be true when 726 * fragments are created through the <fragment> tag, <em>except</em> 727 * in the case where an old fragment is restored from a previous state and 728 * it does not appear in the layout of the current state. 729 */ 730 final public boolean isInLayout() { 731 return mInLayout; 732 } 733 734 /** 735 * Return true if the fragment is in the resumed state. This is true 736 * for the duration of {@link #onResume()} and {@link #onPause()} as well. 737 */ 738 final public boolean isResumed() { 739 return mResumed; 740 } 741 742 /** 743 * Return true if the fragment is currently visible to the user. This means 744 * it: (1) has been added, (2) has its view attached to the window, and 745 * (3) is not hidden. 746 */ 747 final public boolean isVisible() { 748 return isAdded() && !isHidden() && mView != null 749 && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; 750 } 751 752 /** 753 * Return true if the fragment has been hidden. By default fragments 754 * are shown. You can find out about changes to this state with 755 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal 756 * to other states -- that is, to be visible to the user, a fragment 757 * must be both started and not hidden. 758 */ 759 final public boolean isHidden() { 760 return mHidden; 761 } 762 763 /** 764 * Called when the hidden state (as returned by {@link #isHidden()} of 765 * the fragment has changed. Fragments start out not hidden; this will 766 * be called whenever the fragment changes state from that. 767 * @param hidden True if the fragment is now hidden, false if it is not 768 * visible. 769 */ 770 public void onHiddenChanged(boolean hidden) { 771 } 772 773 /** 774 * Control whether a fragment instance is retained across Activity 775 * re-creation (such as from a configuration change). This can only 776 * be used with fragments not in the back stack. If set, the fragment 777 * lifecycle will be slightly different when an activity is recreated: 778 * <ul> 779 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()} still 780 * will be, because the fragment is being detached from its current activity). 781 * <li> {@link #onCreate(Bundle)} will not be called since the fragment 782 * is not being re-created. 783 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)} <b>will</b> 784 * still be called. 785 * </ul> 786 */ 787 public void setRetainInstance(boolean retain) { 788 mRetainInstance = retain; 789 } 790 791 final public boolean getRetainInstance() { 792 return mRetainInstance; 793 } 794 795 /** 796 * Report that this fragment would like to participate in populating 797 * the options menu by receiving a call to {@link #onCreateOptionsMenu} 798 * and related methods. 799 * 800 * @param hasMenu If true, the fragment has menu items to contribute. 801 */ 802 public void setHasOptionsMenu(boolean hasMenu) { 803 if (mHasMenu != hasMenu) { 804 mHasMenu = hasMenu; 805 if (isAdded() && !isHidden()) { 806 mActivity.invalidateOptionsMenu(); 807 } 808 } 809 } 810 811 /** 812 * Return the LoaderManager for this fragment, creating it if needed. 813 */ 814 public LoaderManager getLoaderManager() { 815 if (mLoaderManager != null) { 816 return mLoaderManager; 817 } 818 if (mActivity == null) { 819 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 820 } 821 mCheckedForLoaderManager = true; 822 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, true); 823 return mLoaderManager; 824 } 825 826 /** 827 * Call {@link Activity#startActivity(Intent)} on the fragment's 828 * containing Activity. 829 */ 830 public void startActivity(Intent intent) { 831 if (mActivity == null) { 832 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 833 } 834 mActivity.startActivityFromFragment(this, intent, -1); 835 } 836 837 /** 838 * Call {@link Activity#startActivityForResult(Intent, int)} on the fragment's 839 * containing Activity. 840 */ 841 public void startActivityForResult(Intent intent, int requestCode) { 842 if (mActivity == null) { 843 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 844 } 845 mActivity.startActivityFromFragment(this, intent, requestCode); 846 } 847 848 /** 849 * Receive the result from a previous call to 850 * {@link #startActivityForResult(Intent, int)}. This follows the 851 * related Activity API as described there in 852 * {@link Activity#onActivityResult(int, int, Intent)}. 853 * 854 * @param requestCode The integer request code originally supplied to 855 * startActivityForResult(), allowing you to identify who this 856 * result came from. 857 * @param resultCode The integer result code returned by the child activity 858 * through its setResult(). 859 * @param data An Intent, which can return result data to the caller 860 * (various data can be attached to Intent "extras"). 861 */ 862 public void onActivityResult(int requestCode, int resultCode, Intent data) { 863 } 864 865 /** 866 * @hide Hack so that DialogFragment can make its Dialog before creating 867 * its views, and the view construction can use the dialog's context for 868 * inflation. Maybe this should become a public API. Note sure. 869 */ 870 public LayoutInflater getLayoutInflater(Bundle savedInstanceState) { 871 return mActivity.getLayoutInflater(); 872 } 873 874 /** 875 * @deprecated Use {@link #onInflate(Activity, AttributeSet, Bundle)} instead. 876 */ 877 @Deprecated 878 public void onInflate(AttributeSet attrs, Bundle savedInstanceState) { 879 mCalled = true; 880 } 881 882 /** 883 * Called when a fragment is being created as part of a view layout 884 * inflation, typically from setting the content view of an activity. This 885 * may be called immediately after the fragment is created from a <fragment> 886 * tag in a layout file. Note this is <em>before</em> the fragment's 887 * {@link #onAttach(Activity)} has been called; all you should do here is 888 * parse the attributes and save them away. 889 * 890 * <p>This is called every time the fragment is inflated, even if it is 891 * being inflated into a new instance with saved state. It typically makes 892 * sense to re-parse the parameters each time, to allow them to change with 893 * different configurations.</p> 894 * 895 * <p>Here is a typical implementation of a fragment that can take parameters 896 * both through attributes supplied here as well from {@link #getArguments()}:</p> 897 * 898 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 899 * fragment} 900 * 901 * <p>Note that parsing the XML attributes uses a "styleable" resource. The 902 * declaration for the styleable used here is:</p> 903 * 904 * {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments} 905 * 906 * <p>The fragment can then be declared within its activity's content layout 907 * through a tag like this:</p> 908 * 909 * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes} 910 * 911 * <p>This fragment can also be created dynamically from arguments given 912 * at runtime in the arguments Bundle; here is an example of doing so at 913 * creation of the containing activity:</p> 914 * 915 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java 916 * create} 917 * 918 * @param activity The Activity that is inflating this fragment. 919 * @param attrs The attributes at the tag where the fragment is 920 * being created. 921 * @param savedInstanceState If the fragment is being re-created from 922 * a previous saved state, this is the state. 923 */ 924 public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { 925 onInflate(attrs, savedInstanceState); 926 mCalled = true; 927 } 928 929 /** 930 * Called when a fragment is first attached to its activity. 931 * {@link #onCreate(Bundle)} will be called after this. 932 */ 933 public void onAttach(Activity activity) { 934 mCalled = true; 935 } 936 937 /** 938 * Called when a fragment loads an animation. 939 */ 940 public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { 941 return null; 942 } 943 944 /** 945 * Called to do initial creation of a fragment. This is called after 946 * {@link #onAttach(Activity)} and before 947 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 948 * 949 * <p>Note that this can be called while the fragment's activity is 950 * still in the process of being created. As such, you can not rely 951 * on things like the activity's content view hierarchy being initialized 952 * at this point. If you want to do work once the activity itself is 953 * created, see {@link #onActivityCreated(Bundle)}. 954 * 955 * @param savedInstanceState If the fragment is being re-created from 956 * a previous saved state, this is the state. 957 */ 958 public void onCreate(Bundle savedInstanceState) { 959 mCalled = true; 960 } 961 962 /** 963 * Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} 964 * has returned, but before any saved state has been restored in to the view. 965 * This gives subclasses a chance to initialize themselves once 966 * they know their view hierarchy has been completely created. The fragment's 967 * view hierarchy is not however attached to its parent at this point. 968 * @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. 969 * @param savedInstanceState If non-null, this fragment is being re-constructed 970 * from a previous saved state as given here. 971 */ 972 public void onViewCreated(View view, Bundle savedInstanceState) { 973 } 974 975 /** 976 * Called to have the fragment instantiate its user interface view. 977 * This is optional, and non-graphical fragments can return null (which 978 * is the default implementation). This will be called between 979 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. 980 * 981 * <p>If you return a View from here, you will later be called in 982 * {@link #onDestroyView} when the view is being released. 983 * 984 * @param inflater The LayoutInflater object that can be used to inflate 985 * any views in the fragment, 986 * @param container If non-null, this is the parent view that the fragment's 987 * UI should be attached to. The fragment should not add the view itself, 988 * but this can be used to generate the LayoutParams of the view. 989 * @param savedInstanceState If non-null, this fragment is being re-constructed 990 * from a previous saved state as given here. 991 * 992 * @return Return the View for the fragment's UI, or null. 993 */ 994 public View onCreateView(LayoutInflater inflater, ViewGroup container, 995 Bundle savedInstanceState) { 996 return null; 997 } 998 999 /** 1000 * Get the root view for the fragment's layout (the one returned by {@link #onCreateView}), 1001 * if provided. 1002 * 1003 * @return The fragment's root view, or null if it has no layout. 1004 */ 1005 public View getView() { 1006 return mView; 1007 } 1008 1009 /** 1010 * Called when the fragment's activity has been created and this 1011 * fragment's view hierarchy instantiated. It can be used to do final 1012 * initialization once these pieces are in place, such as retrieving 1013 * views or restoring state. It is also useful for fragments that use 1014 * {@link #setRetainInstance(boolean)} to retain their instance, 1015 * as this callback tells the fragment when it is fully associated with 1016 * the new activity instance. This is called after {@link #onCreateView} 1017 * and before {@link #onStart()}. 1018 * 1019 * @param savedInstanceState If the fragment is being re-created from 1020 * a previous saved state, this is the state. 1021 */ 1022 public void onActivityCreated(Bundle savedInstanceState) { 1023 mCalled = true; 1024 } 1025 1026 /** 1027 * Called when the Fragment is visible to the user. This is generally 1028 * tied to {@link Activity#onStart() Activity.onStart} of the containing 1029 * Activity's lifecycle. 1030 */ 1031 public void onStart() { 1032 mCalled = true; 1033 1034 if (!mLoadersStarted) { 1035 mLoadersStarted = true; 1036 if (!mCheckedForLoaderManager) { 1037 mCheckedForLoaderManager = true; 1038 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1039 } 1040 if (mLoaderManager != null) { 1041 mLoaderManager.doStart(); 1042 } 1043 } 1044 } 1045 1046 /** 1047 * Called when the fragment is visible to the user and actively running. 1048 * This is generally 1049 * tied to {@link Activity#onResume() Activity.onResume} of the containing 1050 * Activity's lifecycle. 1051 */ 1052 public void onResume() { 1053 mCalled = true; 1054 } 1055 1056 /** 1057 * Called to ask the fragment to save its current dynamic state, so it 1058 * can later be reconstructed in a new instance of its process is 1059 * restarted. If a new instance of the fragment later needs to be 1060 * created, the data you place in the Bundle here will be available 1061 * in the Bundle given to {@link #onCreate(Bundle)}, 1062 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and 1063 * {@link #onActivityCreated(Bundle)}. 1064 * 1065 * <p>This corresponds to {@link Activity#onSaveInstanceState(Bundle) 1066 * Activity.onSaveInstanceState(Bundle)} and most of the discussion there 1067 * applies here as well. Note however: <em>this method may be called 1068 * at any time before {@link #onDestroy()}</em>. There are many situations 1069 * where a fragment may be mostly torn down (such as when placed on the 1070 * back stack with no UI showing), but its state will not be saved until 1071 * its owning activity actually needs to save its state. 1072 * 1073 * @param outState Bundle in which to place your saved state. 1074 */ 1075 public void onSaveInstanceState(Bundle outState) { 1076 } 1077 1078 public void onConfigurationChanged(Configuration newConfig) { 1079 mCalled = true; 1080 } 1081 1082 /** 1083 * Called when the Fragment is no longer resumed. This is generally 1084 * tied to {@link Activity#onPause() Activity.onPause} of the containing 1085 * Activity's lifecycle. 1086 */ 1087 public void onPause() { 1088 mCalled = true; 1089 } 1090 1091 /** 1092 * Called when the Fragment is no longer started. This is generally 1093 * tied to {@link Activity#onStop() Activity.onStop} of the containing 1094 * Activity's lifecycle. 1095 */ 1096 public void onStop() { 1097 mCalled = true; 1098 } 1099 1100 public void onLowMemory() { 1101 mCalled = true; 1102 } 1103 1104 /** 1105 * Called when the view previously created by {@link #onCreateView} has 1106 * been detached from the fragment. The next time the fragment needs 1107 * to be displayed, a new view will be created. This is called 1108 * after {@link #onStop()} and before {@link #onDestroy()}. It is called 1109 * <em>regardless</em> of whether {@link #onCreateView} returned a 1110 * non-null view. Internally it is called after the view's state has 1111 * been saved but before it has been removed from its parent. 1112 */ 1113 public void onDestroyView() { 1114 mCalled = true; 1115 } 1116 1117 /** 1118 * Called when the fragment is no longer in use. This is called 1119 * after {@link #onStop()} and before {@link #onDetach()}. 1120 */ 1121 public void onDestroy() { 1122 mCalled = true; 1123 //Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager 1124 // + " mLoaderManager=" + mLoaderManager); 1125 if (!mCheckedForLoaderManager) { 1126 mCheckedForLoaderManager = true; 1127 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1128 } 1129 if (mLoaderManager != null) { 1130 mLoaderManager.doDestroy(); 1131 } 1132 } 1133 1134 /** 1135 * Called when the fragment is no longer attached to its activity. This 1136 * is called after {@link #onDestroy()}. 1137 */ 1138 public void onDetach() { 1139 mCalled = true; 1140 } 1141 1142 /** 1143 * Initialize the contents of the Activity's standard options menu. You 1144 * should place your menu items in to <var>menu</var>. For this method 1145 * to be called, you must have first called {@link #setHasOptionsMenu}. See 1146 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} 1147 * for more information. 1148 * 1149 * @param menu The options menu in which you place your items. 1150 * 1151 * @see #setHasOptionsMenu 1152 * @see #onPrepareOptionsMenu 1153 * @see #onOptionsItemSelected 1154 */ 1155 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 1156 } 1157 1158 /** 1159 * Prepare the Screen's standard options menu to be displayed. This is 1160 * called right before the menu is shown, every time it is shown. You can 1161 * use this method to efficiently enable/disable items or otherwise 1162 * dynamically modify the contents. See 1163 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} 1164 * for more information. 1165 * 1166 * @param menu The options menu as last shown or first initialized by 1167 * onCreateOptionsMenu(). 1168 * 1169 * @see #setHasOptionsMenu 1170 * @see #onCreateOptionsMenu 1171 */ 1172 public void onPrepareOptionsMenu(Menu menu) { 1173 } 1174 1175 /** 1176 * Called when this fragment's option menu items are no longer being 1177 * included in the overall options menu. Receiving this call means that 1178 * the menu needed to be rebuilt, but this fragment's items were not 1179 * included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)} 1180 * was not called). 1181 */ 1182 public void onDestroyOptionsMenu() { 1183 } 1184 1185 /** 1186 * This hook is called whenever an item in your options menu is selected. 1187 * The default implementation simply returns false to have the normal 1188 * processing happen (calling the item's Runnable or sending a message to 1189 * its Handler as appropriate). You can use this method for any items 1190 * for which you would like to do processing without those other 1191 * facilities. 1192 * 1193 * <p>Derived classes should call through to the base class for it to 1194 * perform the default menu handling. 1195 * 1196 * @param item The menu item that was selected. 1197 * 1198 * @return boolean Return false to allow normal menu processing to 1199 * proceed, true to consume it here. 1200 * 1201 * @see #onCreateOptionsMenu 1202 */ 1203 public boolean onOptionsItemSelected(MenuItem item) { 1204 return false; 1205 } 1206 1207 /** 1208 * This hook is called whenever the options menu is being closed (either by the user canceling 1209 * the menu with the back/menu button, or when an item is selected). 1210 * 1211 * @param menu The options menu as last shown or first initialized by 1212 * onCreateOptionsMenu(). 1213 */ 1214 public void onOptionsMenuClosed(Menu menu) { 1215 } 1216 1217 /** 1218 * Called when a context menu for the {@code view} is about to be shown. 1219 * Unlike {@link #onCreateOptionsMenu}, this will be called every 1220 * time the context menu is about to be shown and should be populated for 1221 * the view (or item inside the view for {@link AdapterView} subclasses, 1222 * this can be found in the {@code menuInfo})). 1223 * <p> 1224 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an 1225 * item has been selected. 1226 * <p> 1227 * The default implementation calls up to 1228 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though 1229 * you can not call this implementation if you don't want that behavior. 1230 * <p> 1231 * It is not safe to hold onto the context menu after this method returns. 1232 * {@inheritDoc} 1233 */ 1234 public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 1235 getActivity().onCreateContextMenu(menu, v, menuInfo); 1236 } 1237 1238 /** 1239 * Registers a context menu to be shown for the given view (multiple views 1240 * can show the context menu). This method will set the 1241 * {@link OnCreateContextMenuListener} on the view to this fragment, so 1242 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be 1243 * called when it is time to show the context menu. 1244 * 1245 * @see #unregisterForContextMenu(View) 1246 * @param view The view that should show a context menu. 1247 */ 1248 public void registerForContextMenu(View view) { 1249 view.setOnCreateContextMenuListener(this); 1250 } 1251 1252 /** 1253 * Prevents a context menu to be shown for the given view. This method will 1254 * remove the {@link OnCreateContextMenuListener} on the view. 1255 * 1256 * @see #registerForContextMenu(View) 1257 * @param view The view that should stop showing a context menu. 1258 */ 1259 public void unregisterForContextMenu(View view) { 1260 view.setOnCreateContextMenuListener(null); 1261 } 1262 1263 /** 1264 * This hook is called whenever an item in a context menu is selected. The 1265 * default implementation simply returns false to have the normal processing 1266 * happen (calling the item's Runnable or sending a message to its Handler 1267 * as appropriate). You can use this method for any items for which you 1268 * would like to do processing without those other facilities. 1269 * <p> 1270 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the 1271 * View that added this menu item. 1272 * <p> 1273 * Derived classes should call through to the base class for it to perform 1274 * the default menu handling. 1275 * 1276 * @param item The context menu item that was selected. 1277 * @return boolean Return false to allow normal context menu processing to 1278 * proceed, true to consume it here. 1279 */ 1280 public boolean onContextItemSelected(MenuItem item) { 1281 return false; 1282 } 1283 1284 /** 1285 * Print the Fragments's state into the given stream. 1286 * 1287 * @param prefix Text to print at the front of each line. 1288 * @param fd The raw file descriptor that the dump is being sent to. 1289 * @param writer The PrintWriter to which you should dump your state. This will be 1290 * closed for you after you return. 1291 * @param args additional arguments to the dump request. 1292 */ 1293 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { 1294 writer.print(prefix); writer.print("mFragmentId=#"); 1295 writer.print(Integer.toHexString(mFragmentId)); 1296 writer.print(" mContainerId#="); 1297 writer.print(Integer.toHexString(mContainerId)); 1298 writer.print(" mTag="); writer.println(mTag); 1299 writer.print(prefix); writer.print("mState="); writer.print(mState); 1300 writer.print(" mIndex="); writer.print(mIndex); 1301 writer.print(" mWho="); writer.print(mWho); 1302 writer.print(" mBackStackNesting="); writer.println(mBackStackNesting); 1303 writer.print(prefix); writer.print("mAdded="); writer.print(mAdded); 1304 writer.print(" mRemoving="); writer.print(mRemoving); 1305 writer.print(" mResumed="); writer.print(mResumed); 1306 writer.print(" mFromLayout="); writer.print(mFromLayout); 1307 writer.print(" mInLayout="); writer.println(mInLayout); 1308 writer.print(prefix); writer.print("mHidden="); writer.print(mHidden); 1309 writer.print(" mDetached="); writer.print(mDetached); 1310 writer.print(" mRetainInstance="); writer.print(mRetainInstance); 1311 writer.print(" mRetaining="); writer.print(mRetaining); 1312 writer.print(" mHasMenu="); writer.println(mHasMenu); 1313 if (mFragmentManager != null) { 1314 writer.print(prefix); writer.print("mFragmentManager="); 1315 writer.println(mFragmentManager); 1316 } 1317 if (mImmediateActivity != null) { 1318 writer.print(prefix); writer.print("mImmediateActivity="); 1319 writer.println(mImmediateActivity); 1320 } 1321 if (mActivity != null) { 1322 writer.print(prefix); writer.print("mActivity="); 1323 writer.println(mActivity); 1324 } 1325 if (mArguments != null) { 1326 writer.print(prefix); writer.print("mArguments="); writer.println(mArguments); 1327 } 1328 if (mSavedFragmentState != null) { 1329 writer.print(prefix); writer.print("mSavedFragmentState="); 1330 writer.println(mSavedFragmentState); 1331 } 1332 if (mSavedViewState != null) { 1333 writer.print(prefix); writer.print("mSavedViewState="); 1334 writer.println(mSavedViewState); 1335 } 1336 if (mTarget != null) { 1337 writer.print(prefix); writer.print("mTarget="); writer.print(mTarget); 1338 writer.print(" mTargetRequestCode="); 1339 writer.println(mTargetRequestCode); 1340 } 1341 if (mNextAnim != 0) { 1342 writer.print(prefix); writer.print("mNextAnim="); writer.println(mNextAnim); 1343 } 1344 if (mContainer != null) { 1345 writer.print(prefix); writer.print("mContainer="); writer.println(mContainer); 1346 } 1347 if (mView != null) { 1348 writer.print(prefix); writer.print("mView="); writer.println(mView); 1349 } 1350 if (mAnimatingAway != null) { 1351 writer.print(prefix); writer.print("mAnimatingAway="); writer.println(mAnimatingAway); 1352 writer.print(prefix); writer.print("mStateAfterAnimating="); 1353 writer.println(mStateAfterAnimating); 1354 } 1355 if (mLoaderManager != null) { 1356 writer.print(prefix); writer.println("Loader Manager:"); 1357 mLoaderManager.dump(prefix + " ", fd, writer, args); 1358 } 1359 } 1360 1361 void performStop() { 1362 onStop(); 1363 1364 if (mLoadersStarted) { 1365 mLoadersStarted = false; 1366 if (!mCheckedForLoaderManager) { 1367 mCheckedForLoaderManager = true; 1368 mLoaderManager = mActivity.getLoaderManager(mIndex, mLoadersStarted, false); 1369 } 1370 if (mLoaderManager != null) { 1371 if (mActivity == null || !mActivity.mChangingConfigurations) { 1372 mLoaderManager.doStop(); 1373 } else { 1374 mLoaderManager.doRetain(); 1375 } 1376 } 1377 } 1378 } 1379} 1380